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Related Experiment Videos

Ascorbate synthesis-dependent glutathione consumption in mouse liver

G Bánhegyi1, M Csala, L Braun

  • 11st Institute of Biochemistry, Semmelweis Medical University, Budapest, Hungary.

FEBS Letters
|February 26, 1996
PubMed
Summary

Ascorbate synthesis in the liver consumes reduced glutathione (GSH). Hydrogen peroxide produced during this process contributes to GSH depletion, potentially explaining why losing this synthesis ability may be evolutionarily beneficial.

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Area of Science:

  • Biochemistry
  • Cellular Metabolism
  • Evolutionary Biology

Background:

  • Ascorbate (vitamin C) synthesis occurs in the liver of many mammals.
  • Reduced glutathione (GSH) is a critical cellular antioxidant.
  • The relationship between ascorbate synthesis and GSH metabolism is not fully understood.

Purpose of the Study:

  • To investigate the impact of ascorbate synthesis on GSH levels in murine hepatocytes.
  • To elucidate the mechanism by which ascorbate synthesis affects GSH consumption.
  • To explore the potential evolutionary implications of this metabolic interaction.

Main Methods:

  • Isolated murine hepatocytes were used to study ascorbate production.
  • Reduced glutathione (GSH) levels were measured following gulonolactone addition.

Related Experiment Videos

  • Hepatic microsomal membranes were analyzed to assess GSH consumption during ascorbate synthesis.
  • The effects of catalase and mercaptosuccinate on GSH levels were examined.

    • Main Results:

    • Gulonolactone stimulated ascorbate production in hepatocytes, concurrently decreasing GSH levels.
    • Ascorbate synthesis in hepatic microsomes led to near-equimolar GSH consumption.
    • Catalase or mercaptosuccinate addition mitigated GSH depletion, implicating hydrogen peroxide.

    Conclusions:

    • Ascorbate synthesis directly consumes GSH in the liver.
    • Hydrogen peroxide generated during ascorbate synthesis is a key factor in GSH depletion.
    • This GSH consumption mechanism may provide an evolutionary advantage for species that have lost the ability to synthesize ascorbate.